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Healthcare research pursues, most of the time, to find natural sources of bioactive compounds for treatment of various diseases. A source of natural compounds with therapeutically effect is represented by plants that have been used, for thousands years, in traditional medicine. Usnea barbata L. is a lichen – a symbiotic organism with a special structure: fungus and alga. In this case, the resulted thallus, is very different in structure, properties and natural compounds, to the two plants taken separately. These...